media retention
... media medium的复数 media retention 介质保持 medial alligation 求平均值 ...
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将该区与液体介质保持接触，该液体介质用来补充区内的液体并保持区中混合物组分基本不变。
The zone is maintained in contact with a liquid medium that serves to replenish the liquid in the zone and maintain the composition of the mixture in the zone substantially constant.
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